Extension for cutter-heads.



2 0 E m 5., 2 .D e F d e t n e t a D... E IL W A H E Q 0 6 4 9 6 nw N EXTENSION FOR CUTTER HEADS.

I (Applicatiog filed Nov. 11, 1901.)

(No Model.)

UNITED STATES PATENT OFFICE.

CHARLES E. HAWLEY, OF BERKELEY, CALIFORNIA.

EXTENSION FOR CUTTER-HEADS.

SPECIFICATION forming part of Letters Patent No. 694,060, dated February 25, 1902.

Application filed November 11, 1901. Serial No. 81,807. (No'modeh) To all whom it may concern.-

Be it known that I, GHARLESE. HAWLEY, a citizen of the United States, residing at Berkeley, county of Alameda, State of California, have invented an Improvementin Extensions for Cutter-Heads; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in attachments for planing, grooving, matching, and similarly-acting machines.

The cutter-head of a molding-machine usually consists of a rectangular block secured on a spindle and carrying a knife which acts upon the timber as the latter is fed up to the head.

It is the object of my invention to provide a simple and serviceable extension attachment for the cutter-head whereby the depth of cut may be varied, still using the same knife for all depths of the same form of out, while the knife is brought up to the work with a better cutting angle.

It consists in the combination,with a cutterhead, of detachable blocks extending radially from said head, so that a line through sub stantially the center of the blocks will intersect the axis of the head, and means on these blocks whereby a knife may be rigidly held and made to present its cutting edge in proper relation to the work in hand. 7

It also includes plates or distance-pieces which are adapted to be interposed between the blocks and the head to increase the range of cut, and comprises details which will be more fully set forth hereinafter, having reference to the accompanying drawings, in which- Figure 1 is an end View of my invention. Figs. 2 and 3 are modified forms of the same.

A represents a cutter-head, of rectangular form, secured upon a spindle 2 of a moldingmachin'e. The faces of the head are transversely channeled, as at 3, and the usual cutter or knife 4:, having the longitudinal slot 5, is secured to the head by means of a bolt 6, fitting the channel and extending through the knife. There are usually two or more of these knives disposed upon the head. Ordinarily the depth of cut is varied by shifting the knife so as to allow the latter to project more or less beyond the edge of the head. I

have already indicated the disadvantages of such a procedure. When it is desired to increase the depth of out beyond a point where the unsupported knife or cutter works to fullest advantage, I use an extension or block of either the form shown in Fig. 1 or Fig. 2, 7

centrally perforated for the passage of the bolt 6, by which all the parts are firmly bound together and held in place on the head. The shape of the cap is such that when the parts are in position the upper surface of the cap is essentially parallel to the bottom of the block, so that the head of the bolt and the nut are given a square seat. If it is desired still to increase the depth of out beyond the limit afforded by the block, I may employ blanks or distance-pieces 11. They consist of plates having upon one side a channel 12 and on the other a corresponding projection 13 and are centrally perforated. They are generally made in sizes of one-half an inch and inch thicknesses. By the interposition of oneor more of these between the block and the cutter-head the depth of cut may be increased at will. The style of block 7, however, is not intended for extra deep cuts, as the strain on the single bolt becomes augmented with the greater distance the point of the knife is removed from the center of the head.

For depths, say, above two or three inches I prefer to use a block after the style shown in Fig. 2 or Fig. 3. Here (Fig. 2) are shown two blocks 7, disposed upon opposite sides of the cutter-head and held together by means of the bolts 6. These blocks are trapezoidal in form, with their outer surfaces 8 inclined in relation to their bases 14 and their highest point in the direction of rotation of the head. The bottom of each block is provided with a transverse ledge 9, similar to and for the same purpose as that shown on original block 7. The projecting ends of the base portions are perforated, and the bolts 6' engage the blocks through these perforations and exterior to the cutter-head. The faces 8 of the blocks are provided with channels 15,similar to the channels 3 on the cutter-head, and the knife is held to the block by means of a bolt 16. Blanks 11 may be interposed between the blocks and head, if desired, it only being necessary to provide bolts of sufficient length.

The result of an extension so made and secured to the head is that the knife is given a rigid support. The same knife that was used upon the cutter-head itself in making the shallowest cut may still be used in making the deepest cut. The point of the knife projects no more than in the first case, and by inclining the knives, as shown, they are brought up to the work at the most advantageous cutting angle. A cutter-head thus equipped is adapted for beveling elevator guide-posts, grooving deep gutters, or other similar work.

In Fig. 3 is shown a block similar to that last above described, except merely as to configuration. In extra-deep cuts this form may be used, and the sides are concaved for the purpose of saving metal.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination with a cutter-head, of a detachable radial extension fitted to the head in such position that a line through substantially the center of the extension will intersect the axis of the head, aknife, and means for attaching the knife to the outer face of the extension.

2. The combination with a cutter-head, of a detachable radial extension fitted to the head in such position that a line longitudinally through substantially the center of the extension will intersect the axis of the head, said extension having an inclined outer surface, and a knife and means for attaching it to said surface.

3. The combination with a cutter-head, of a block, extension-blanks adapted to be inserted between the block and head, and means forattaching a knife to the block, and means for securing the knife, block and blanks rigidly to the cutter-head.

4:. A cutter-head extension consisting of a block adapted to seat upon acutter-head in such manner that a line projected through substantially the longitudinal center of the extension will intersect the axis of the head, means for preventing displacement on the extension on the head, said block having an outer inclined surface upon which a knife is supported, and means for detachably'securing said block to a cutter-head.

5. The combination with a cutter-head, of radial extension-blocks disposed upon opposite sides of said head, said blocks having their outer faces inclined and their longitudinal centers substantially radially in line with the axis of the head, knives secured upon said inclined faces and means exterior to the cutter-head whereby said blocks are held rigidly thereon.

In witness whereof I have hereunto set my hand.

CHARLES E. l-IAWLEY.

Witnesses:

S. H. NoURsn, J ESSIE C. Bnonin. 

